Telephonic repeater and relay



(No Model.)

J. A. MALONEY.

TELEPHONIG REPEATER AND RELAY.

No. 287.449. Patented Oct. 30, 1883.

lhl

-. uns mm. wit-mm. 01.

UNITED STATES PATENT OFFICE.

JAMES A. MALOXEY, OF XVASHINGTOX, DISTRICT OF COLUMBIA.

TELEPHONIC REPEATER AND RELAY.

SPECIFICATION forming part of Letters Patent No. 287,449, dated October 30, 1883.

Application filed March 3, 1883. (No model.)

To all whom it may concern Be it known that 1, JAMES A. )IALOXEY, of \Vashington city, in the District of Columbia, have invented certain. new and useful Improvements in Telephonic Repeaters and Relays, of which the following is a specification.

My improvement has been designed with reference to the needs of telephonic eommunication over long lines-as, for instance, intercity communication; and its object is to reenforce by renewed electric energy at the receiving-station, or at intermediate stations along the line, the enfeebled current which influences the receiving or reproducing telephonic instrument. V

In Letters Patent to me, No. A71 353 bearing date March 20, 1883,I have described and shown the combination, in a telephonic circuit, with a receiver and transmitter, of a condenser which is arranged and operates to intermittently discharge to line through the diaphragm of the transmitter when the latter is in useboth the circuit through which the condenser is charged and the circuit through which the condenser discharges to line being completed through the transmitter. By my present improvement I make use of substantially the same method of transmission as applied to the receiver in order to bring in a renewed electric energy, which is made available for the further transmission of the message, or for the reproduction of the same. To this end I combine with the instrument-which may be termed a telephonic relay or repeater located at the point where it is desired to throw renewed electric energy into the line, a condenser, a battery for charging the same, and circuit connections, substantially as hereinafter described, whereby, whenthe line is in use, both the circuit through which the battery charges the condenser and the circuit through which the condenser discharges to line are completed through the said instrument.

. The nature of my invention and the manner in which the same is or may be carried into eifect will be understood by reference to the accompanying drawings, in which- Figure l. is a plan of the receiving-instru ment. Fig. 2 is a like view of the instrument,

on smaller scale, together with a diagrammatic representation of its circuit-connections.

The relay or repeating instrument represented in the drawings is one of that type of receivinginstruments in which the sound-vibrations are reproduced by a diaphragm, A,

which is influenced by a permanent magnet. B, surrounded by a helix, O, in the line 1, of which one terminal is grounded, as at a, and the other terminal is in circuit with the transmitter y at the sending-station, as indicated diagrannnatically in Fig. 2. I desire it to be understood, however, that receiving -instrnments of other types can be employed:

Diaphragm A is made of conducting material. Upon one of its faces is a carbon contact, a, and upon its opposite face is a carbon contact, I). Opposite a is the spring-mounted carbon a, electrically connected by wire 2 to binding-post c, which, by line-wire 3, is in connection with the receiver 2 at the station to which the message is to be transmitted from the sending-station 3 the circuit being completed through receiver a to ground, as i11- dicated in Fig. 2. Opposite I) is the springmounted carbon contact I), electrically connected by wire at to binding-post d, from which leads wire 5. to one pole of battery D, whose other pole is grounded. This battery is a local battery at the same station with the receiving-instrument or repeater A BC, and is designed to charge the condenser located at the same station. This condenser is indicated at E. One of its poles is electrically connected to the diaphragm A by wires 6 7 and bindingpost 6, and its other pole is grounded.

This completes a description of the instrumentalities employed. The adjustments of the carbon contacts are such that normally the points a a have incomplete or imperfect contact with one another, and the points I) I) are in full contact with one another, as indicated in the drawings. Thus, normally, when the line is not in use, the condenser E is in circuit with and is charged by battery D through 5 d at I) I) A 7 c 6; but when the diaphragm A is thrown into vibration by the receiving de- Vice B O-due to the action thereon of the electrical impulses on the line-wire 1 occasioned by speaking into the transmitter g it will make fullcontact between a a and b b alter-' relay or repeater I am enabled to throw into the line beyond it electrical impulses similar incharacter to those transmitted from y to the repeater or relay, both the circuit through which the local battery charges the condenser by which these electrical impulses are thrown into the line and the circuit through which the condenser discharges to line being completed through the diaphragm of the relay or repeater.

I have shown the line arranged for trans mitting in one direction only; but it will, of course, be understood that by duplicating the instruments at the several stations and properly connecting them up to line messages can be sent in both directions.

Having described my invention, what I claim, and desire to secure by Letters Patent, is as follows:

1. A telephonic relay or repeater comprising the combination, with a receiving-instrument adapted to be put in circuit with and acted 011. by the transmitter at the sendingstation, of a condenser abattery, and circuitconnections, substantially as described, where- I v by both the circuit through which the battery charges the condenser and the circuit through which the condenser dischargesto line beyond the relay or. repeater are completed through the said receiving-instrument, substantially as and for the purposes set forth.

2. In a telephonic system, the combination, with the transmitter at the sending-station and the receiver at the receiving-station, of an- .mtermediate receiving-instrument whosehelix, is in circuit with the transmitter, and whose diaphragm is in electrical connection with the receiver at the receiving-station, and a condenser, a charging-battery therefor, and circuit-connections, substantially as described, whereby both the circuit through which the battery charges the condenser and the circuit through which the condenser discharges to the line intermediate between .the diaphragm and I the receivingstation are completed through saiddiaphragm, substantially as and. for the purposes set forth.

In testimony whereof; I have hereunto set my hand this lstday of March, 1883.

JAMES A. MALONEY.

- Vitnesses:

J. WALTER BLANDFORD, EwELL A. DICK. 

